new_user_dialog update readme

plugins/new_user_dialog/README.md

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+# RoundCube New User Dialog Plugin
+When a new user is created, this plugin checks the default identity and sets a session flag in case it is incomplete. An overlay box will appear on the screen until the user has reviewed/completed his identity.
+
+## Configuration
+Optional you can specify the default signature, `@EMAIL@` is replaced by the user email.
+
+```
+$config['new_user_dialog_signature_text'] = '
+Your Name
+
+E-Mail : @EMAIL@
+Website: some.domain
+Phone: 01234/567890
+';
+```